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Abstract: Commonalities among the order parameters of the ubiquitous antiferromagnetismpresent in the parent compounds of the iron arsenide high temperaturesuperconductors are explored. Additionally, comparison is made between the wellestablished two-dimensional Heisenberg-Ising magnet, K$ 2$NiF$ 4$ and ironarsenide systems residing at a critical point whose structural and magneticphase transitions coincide. In particular, analysis is presented regarding twodistinct classes of phase transition behavior reflected in the development ofantiferromagnetic and structural order in the three main classes of ironarsenide superconductors. Two distinct universality classes are mirrored intheir magnetic phase transitions which empirically are determined by theproximity of the coupled structural and magnetic phase transitions in thesematerials.



Author: Stephen D. Wilson, C. R. Rotundu, Z. Yamani, P. N. Valdivia, B. Freelon, E. Bourret-Courchesne, R. J. Birgeneau

Source: https://arxiv.org/



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